Process, building on older in order to advance new ideas.
The development of science is usually a
es )
A)
gradual; knowledge
B)
scattershot; ideas
hasty, developments
D
laboratory; institutions

A)  gradual; knowledge

Explanation:

Gradual building of knowledge over one another is fundamental way in which science is developed.

Science follows a systematic approach to study an observation. Each step of the scientific method is to build on existing and known idea about a particular phenomenon. An observation is made, questions asked, hypothesis formulated and experiments are designed to know how valid they are. Subsequent researches also builds on this flow of investigating a phenomenon.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!